Hi, I've been doing some very large procedural terrains, populating up to about 11billion polys with the eco system. I've not seen this problem you've had once. Occasionally it will run out of memory and I'll need to restart but not this separation you have. On the off chance, have you got the beta update for 5i from the eon website? V5i won't automatically update this one as it's still in beta. Perhaps this fixes the problem you're having with a bit of luck :)